Budgets of major ionic species and nutrients on a dam reservoir in forested watershed

2007 ◽  
Vol 56 (1) ◽  
pp. 287-293 ◽  
Author(s):  
Y. Komai ◽  
S. Umemoto ◽  
Y. Takeda ◽  
T. Inoue ◽  
A. Imai
Keyword(s):  
Water Surface ◽  
Stream Water ◽  
Ionic Species ◽  
Forested Watershed ◽  
Bulk Precipitation ◽  
Dam Reservoir ◽  
Average Precipitation ◽  
Investigation Period ◽  
Rain Events

To evaluate the role of a dam reservoir in the runoff of pollutant loadings from a forested watershed, the input–output budgets in the Ikuno dam reservoir had been investigated for eight years since 1996. The T-N, T-P, TOC and major ionic species in the bulk precipitation, stream water, and outflow were measured. The residence time calculated by using the data of the inflow and outflow was 0.3 year. The average precipitation was 1,772 mm during the investigation period (1996–2004). The direct deposition to water surface was less than one percentage to total loadings of nutrients and major ionic species. The ratios of output to input of TOC, TN, and TP were 1.04 to 1.42, and those of major ionic species were from 0.83 to 0.99 except for NO3−, which was 1.12. However, the ratios of output to input of major ionic species except for NO3− at the Ikuno dam reservoir will be larger, and those of NO3−, TOC, TN, and TP will be smaller, if we also include rain events. These results suggested that the dam reservoir played a role as a sink for pollutants in forested watershed, and that the pollutant loadings to downstream may decrease.

Runoff characteristics of major ionic species during rain events in forested watershed

2001 ◽  
Vol 44 (7) ◽  
pp. 105-112
Author(s):  
A. Y. Komai ◽  
S. Umemoto ◽  
T. Inoue
Keyword(s):  
Surface Soil ◽  
Stream Water ◽  
Ionic Species ◽  
Storm Event ◽  
Forested Watershed ◽  
Output Surface ◽  
Opposite Change ◽  
Subsurface Runoff ◽  
Anions And Cations ◽  
Rain Events

The runoff characteristics of major ionic species from a stream in a forested watershed were investigated during two rain events. The values of EC and the concentrations of alkalinity, anions and cations, except for NO3−, decreased according to the increase of discharge, and showed a sharp lower peak. On the other hand, the concentrations of NO3− and K+ indicated an opposite change. The amount of output of anions and cations was also larger than those of the input, especially in a storm event. During a storm event, the NO3− concentrations in soil water 20 cm deep taken by a tension lysimeter were not detected, even though the surface soil of 0-5 cm deep included 20 to 50 mg/kg of NO3−. The direct contribution for NO3− concentrations by suspended solids in water was estimated through three percentages of the stream water output. Surface runoff was also not observed. These results suggest that the prompt subsurface runoff of the direct runoff from surface layer of soil may be predominant during rainfall in the forested area, and the increase of NO3− concentrations in the stream may be caused through the process.

scholarly journals The role of extreme rain events in driving tree growth across a continental‐scale climatic range in Australia

Ecography ◽  
2021 ◽  
Author(s):  
Alison J. O'Donnell ◽  
Michael Renton ◽  
Kathryn J. Allen ◽  
Pauline F. Grierson
Keyword(s):  
Tree Growth ◽  
Continental Scale ◽  
Extreme Rain ◽  
Climatic Range ◽  
Rain Events

scholarly journals Using GIS for assessing stream water chemistry in a forested watershed

2009 ◽  
Vol 17 (1) ◽  
pp. 53-62
Author(s):  
Akiyuki KAWASAKI ◽  
Reiji FUJIMAKI ◽  
Nobuhiro KANEKO ◽  
Satoru SADOHARA
Keyword(s):  
Water Chemistry ◽  
Stream Water ◽  
Forested Watershed ◽  
Stream Water Chemistry

Numerical Simulation using RANS-based Tools for America’s Cup Design

2003 ◽  
Author(s):  
Geoff Cowles ◽  
Nicola Parolini ◽  
Mark L. Sawley
Keyword(s):  
Design Process ◽  
Water Surface ◽  
Navier Stokes ◽  
Computational Fluid Dynamics Simulations ◽  
America’S Cup ◽  
Dynamics Simulations ◽  
École Polytechnique ◽  
Cup Design ◽  
Cup Drawing

The application of Computational Fluid Dynamics simulations based on the Reynolds Averaged Navier- Stokes (RANS) equations to the design of sailing yachts is becoming more commonplace, particularly for the America's Cup. Drawing on the experience of the Ecole Polytechnique Fédérale de Lausanne as Official Scientific Advisor to the Alinghi Challenge for the America’s Cup 2003, the role of RANS-based codes in the yacht design process is discussed. The strategy for simulating the hydrodynamic flow around the boat appendages is presented. Two different numerical methods for the simulation of wave generation on the water surface are compared. In addition, the aerodynamic flow around different sail configurations is investigated. The benefits to the design process as well as its limitations are discussed. Practical matters, such as manpower and computational requirements, are also considered.

scholarly journals Interaction of Small Ionic Species With Phospholipid Membranes: The Role of Metal Coordination

2019 ◽  
Vol 5 ◽  
Author(s):  
Chanh Thi Minh Le ◽  
Aamd Houri ◽  
Nimalka Balage ◽  
Brian J. Smith ◽  
Adam Mechler
Keyword(s):  
Ionic Species ◽  
Metal Coordination ◽  
Phospholipid Membranes

scholarly journals Rare European donacid beetle Macroplea appendiculata PANZER, 1794 (Coleoptera: Chrysomelidae: Donaciinae) common in Polish fish ponds

2012 ◽  
Vol 81 (4) ◽  
pp. 321-330
Author(s):  
Radosław Ścibior ◽  
Robert Stryjecki ◽  
Marek Nieoczym ◽  
Jan Bezdĕk
Keyword(s):  
Water Body ◽  
Rare Species ◽  
Crucial Role ◽  
Water Surface ◽  
Small Extent ◽  
Benthic Organism ◽  
Fish Ponds ◽  
Low Oxygen ◽  
Low Rate

ABSTRACT Macroplea appendiculata PANZER, 1794 is an extremely rare species in Poland and Europe. This paper provides new data on the ecology of this species. 24 specimens of M. appendiculata were collected in fish ponds at Samoklęski. This beetle was caught mainly with active traps placed on the bottom, but it was not found in traps set just below the water surface. The data show that M. appendiculata is a typical benthic organism, moving vertically to only a small extent. The low rate of metabolism allows this beetle to inhabit waters of varied, as well as low, oxygen content. The occurrence of the most numerous population of M. appendiculata in fish ponds, currently known in Poland, indicates the crucial role of this kind of water body as a habitat for this species.

scholarly journals Online Discourse in the Context of COVID-19, the First Health Crisis in China after the Advent of Mobile Social Media: A Content Analysis of China’s Weibo and Baidu

2020 ◽  
Vol 9 (10) ◽  
pp. 167
Author(s):  
Christian Carvajal-Miranda ◽  
Luis Mañas-Viniegra ◽  
Li Liang
Keyword(s):  
Social Media ◽  
Online Media ◽  
Online Discourse ◽  
Health Crisis ◽  
Media Environment ◽  
The Social ◽  
Media Platform ◽  
Investigation Period ◽  
Universal Health

The COVID-19 epidemic was the first universal health crisis since China entered the era of mobile social media. When Severe Acute Respiratory Syndrome (SARS) broke out in 2003, it was not until almost six years later that Weibo was born, marking China’s entry into the era of mobile social media (Weixin 2020). In this context, this research analysed the role of the social media platform Weibo and the Internet search browser Baidu, in a government controlled online media environment, during the COVID-19 pandemic. In order to undertake this study, we applied the use of content and sentiment analysis to the discourse identified through the topics published during the investigation period, which encompassed 15 December 2019 until 15 March 2020. From the findings of this study, we concluded that, during the pre- and post-COVID-19 period, there was an important presence of social and lifestyle topic categories dominating the online discourse, which dramatically changed in correlation to the increasing spread of the disease. Additionally, there was a marked absence of topics in relation to economic and political information, and there was a notable absence of an official Government “voice” generating topics.

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